linux-kernel - Re: [PATCH 2/8] scsi: libsas: check the lldd callback correctly

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Date:   Thu, 31 May 2018 15:09:41 +0100
From:   John Garry <john.garry@...wei.com>
To:     Jason Yan <yanaijie@...wei.com>, <martin.petersen@...cle.com>,
        <jejb@...ux.vnet.ibm.com>
CC:     <linux-scsi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <zhaohongjiang@...wei.com>, <hare@...e.com>,
        <dan.j.williams@...el.com>, <jthumshirn@...e.de>, <hch@....de>,
        <huangdaode@...ilicon.com>, <chenxiang66@...ilicon.com>,
        <xiexiuqi@...wei.com>, <tj@...nel.org>, <miaoxie@...wei.com>,
        Ewan Milne <emilne@...hat.com>, Tomas Henzl <thenzl@...hat.com>
Subject: Re: [PATCH 2/8] scsi: libsas: check the lldd callback correctly

On 29/05/2018 03:23, Jason Yan wrote:
> We are using lldd_port_deformed so we'd better check if lldd_port_deformed
> is NULL.
>
> Signed-off-by: Jason Yan <yanaijie@...wei.com>
> CC: John Garry <john.garry@...wei.com>
> CC: Johannes Thumshirn <jthumshirn@...e.de>
> CC: Ewan Milne <emilne@...hat.com>
> CC: Christoph Hellwig <hch@....de>
> CC: Tomas Henzl <thenzl@...hat.com>
> CC: Dan Williams <dan.j.williams@...el.com>
> CC: Hannes Reinecke <hare@...e.com>
> ---
>  drivers/scsi/libsas/sas_discover.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
> index a0fa7ef3a071..354f6db5bb66 100644
> --- a/drivers/scsi/libsas/sas_discover.c
> +++ b/drivers/scsi/libsas/sas_discover.c
> @@ -260,7 +260,7 @@ static void sas_suspend_devices(struct work_struct *work)
>  	 * phy_list is not being mutated
>  	 */
>  	list_for_each_entry(phy, &port->phy_list, port_phy_el) {
> -		if (si->dft->lldd_port_formed)
> +		if (si->dft->lldd_port_deformed)

If you do make this change, then you can remove 
hisi_sas_port_deformed(), as it is just a stub to avoid a jump to NULL 
from above.

>  			si->dft->lldd_port_deformed(phy);
>  		phy->suspended = 1;
>  		port->suspended = 1;
>